O,S-dihydrocarbyl-N-alkylthio- or N-arylthio phosphoroamidothioates as insecticides

ABSTRACT

Compounds of the formula   wherein R and R1 are independently alkyl, alkenyl or alkynyl; R2 is hydrogen, alkyl or -SR3; and R3 is alkyl optionally substituted with halogen atoms or aryl optionally substituted with alkyl groups or halogen atoms, are used as insecticides.

United States Patent Brown, deceased Nov. 4, 1975 O,S-DIHYDROCARBYL-N-ALKYLTHIO- OR 2,97I,020 2/l96l Schrader .2 260/959 x N ARYLTH]0 3,309,266 3/1967 Magee 424/220 PHOSPHOROAMIDOTHIOATES AS FOREIGN PATENTS OR APPLICATIONS INSECTICIDES 1,022,537 H1958 Germany [75} Inventor: Melancthon S. Brown, decease, late of Berkeley, Calif, by Gustave K. Primary Examiner-Jerome D. Goldberg KOhfl. Special Administrator Assistant Examiner-Allen J. Robinson Atlorne A em or Firm-J. A. Buchanan Jr. Dix A. [73] Am nee: Chevron Research Com San g g Francisco, Calif. pany News; Raymond Owyang [22] FIled: July 11, 1974 [57] ABSTRACT [21] Appl' 486'122 Compounds of the formula Related US. Application Data [60] Continuation of Ser. No. 345,403, March 27, I973, R0 0 R9 abandoned, which is a division of Ser. No, 155,292, 1 June 2], 1971, Pat No 3,755,507 P-N RS/ sR [52] US. Cl. 424/215 [51] Int. Cl AOln 9/36 [58] Field of Search I. 424/216, 215-, 260/947, wherem R and are Independently alkyl, alkenyl Or 260/959 alkynyl; R is hydrogen, alkyl or SR and R is alkyl optionally substituted with halogen atoms or aryl op- 5 References Ci tionally substituted with alkyl groups or halogen UNITED STATES PATENTS atoms, are used as insecticides.

2.957.020 lO/l960 Perkow 260/959 X 28 Claims, N0 Drawings (),S-DIIIYDROCARBYL-N-ALKYLTHIO- OR N-ARYLTHIO PHOSPHOROAMIDOTHIOATES AS INSECTICIDES This is a continuation of application Ser. No. 345.403, filed Mar. 27, 1973. now abandoned, which, in turn, is a division of application Ser. No, 155,292, filed June 21, 1971, now US. Pat. No. 3,755,507.

118. Pat. No, 3,309,266 discloses certain O-a1kyl-S- b alkyl phosphoroamidothioates and their use as insecticides. See also Netherlands Pat. No. 6,911,926 directed to certain O-alkyl-S-alkyl phosphoroamidothionates, Also US. Pat. No, 3,51 1,632 discloses certain N-substituted phosphoroamidothioates which are useful as herbicides.

DESCRIPTION OF THE INVENTION The compounds of the present invention can be represented by the following formula wherein R and R are individually alkyl, alkenyl or al kynyl of l to 3 carbon atoms; R is hydrogen, alkyl of 1 to 3 carbon atoms or SR and R is alkyl of 1 to 4 carbon atoms substituted with to 4 halogen atoms of atomic number 9 to (fluorine, chlorine or bromine), or aryl of 6 to 12 carbon atoms substituted with (l to 4 alkyl groups individually of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to 35. Generally, the total number of substituents on the aryl group will not exceed 4. The R and R groups may be the same or different. Of course, when R and R are alkenyl or alkynyl, the minimum number of carbon atoms is 2.

Preferably R and R are alkyl of l to 3 carbon atoms, more preferably alkyl of l to 2 carbon atoms, Preferably R and R will be the same.

Preferably R is hydrogen or -SR wherein R is aryl of 6 to 12 carbon atoms substituted with O to 4 alkyl groups individually of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

Preferably R is alkyl of 1 to 2 carbon atoms. alkyl of l to 2 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with (1 to 2 alkyl groups of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to 35, The most preferred R groups will he halogenated alkyl groups such as halomethyl or haloethyl, particularly tetrachloroethyl or phenyl substituted with O to 1 alkyl group, preferably methyl or halogen atoms, preferably chlorine.

Representative radicals which R and R may repre sent include methyl, ethyl, n-propyl, isopropyl, vinyl, allyl or propargyl.

- phosphoroamidothioate,

Representative groups which R may represent. in addition to hydrogen, include methyl, ethyl, n-propyl, isopropyl, tetrachloroethylthio. perchloromethylthio, dichloromethylthio. l,2,2-trichloroethylthio, phenylthio, m-chlorophenylthio. pchlorophenylthio, pmethylphenylthio, etc.

Representative groups which R may represent include methyl, ethyl, n-propyl, isopropyl, butyl, 1- chloroethyl, 2,2-dichloroethyl, 1,2,2-trichloroethyl, l,2,2,3-tetrachloropropyl, 1,1 ,2,2tetrachl0roethyl, fluorodichloromethyl, bromodiehloromethyl, 1 ,1- dichloro 2,Z-dibromoethyl, 1,1-dichloro-2,2-difluoroethyl, phenyl, naphthyl, p'butylphenyl, p-methylphenyl, o-methylphenyl, o,p-dimethylphenyl, p-chlorophenyl, m-bromophenyl, o-fluorophenyl, 2-chloro-4- methylphenyl, 2,4,6-trichlorophenyl, o-ethylphenyl, p-propylphenyl, etc.

Representative compounds of the present invention include O,S-dimethyl N-mcthylthiophosphoroamidothioate O,S-dimethylN-ethylthiophosphoroamidothioate, O,S-dimethyl N-propylthiophosphoroamidothioate, O,S-dimethy1-N-triehloromethylthiophosphoroamidothioate, O,S-dimethyl-N-1,2,2,2-tetrachloroethylthiopltosphoroamidothioate, O,S-dimethyl- N- 1,1 ,2,2-tetrachloroethylthiophosphoroamidothioate, O-methyl-S-ethyLN-l ,1 ,2,Z-tetrachloroethylthiophosphoroamidothioate, Oethyl-S-methyl-N-l,1,2,2-tetrachloroethylthiophosphoroamidothioate, O-methyl-S- allyl-N- l 1.2,2tetrachloroethylthiophosphoroamido thioate, O-methyl-S-propargy|N-1,2,2,2-tetrachloroethylthiophosphoroamidothioate. O,S-dimethyl-N- l l ,2,2,-tetrachloropropylthiophosphoroamidothioate, O-methyl-S-propyl-N-1 ,2,2-trichloroethylthiophosphoroamidothioate, O methyl-S-ethyl-N-pheny1thiophosphoroamidothioate, O,S-dimethyl-N-4-ehlorophenylthiophosphoroamidothioate, O,S-dimethyl-N- 3,4-dichlorophenylthiophosphoroamidothioate, O,S- dimethyl-N-Z,4-dichlorophenylthiophosphoroamidothioate, O,S-dimethyl-N2-fluorophenylthiophosphoroamidothioate, O,S-dimethyl-N-3-methylphenylthiophosphoroamidothioate, O,S-dia11y1-N-trichloromethylthiophosphoroamidothicate, O,S-diethyl- N-l ,1,2,2-tetrachloroethylthiophosphoroamidothioate, O,S-dipropargyl-N'4chlorophenylthiophosphoroamidothioate, O-ethyl-S-methyl-N-2-chloro-4- bromophenylthiophosphoroarnidothioate, 0,0- dimethyl-N-2,4,6-tribromophenylthiophosphoroamidothioate, O,S-dimethyl-N-3-fluoro-4- methylphenylthiophosphoroamidothioate, Omethyl-S- ethyl-N- l -bromo2,2,2-trichloroethylthiophosphoroamidothioate, O-ethyl-S-methyl-N- 1 ,l-dichloro- 2,2-dibromoethylthiophosphoroamidothioate, Oallyl- S-methyLN-4-chlorophenylthiophosphoroamidothioate, O,S-dipropargyl-N1, l ,2,2-tetrachloroethylthio- O,Sdia1lyl-N-phenylthiophosphoroamidothioate, O,S-diethyl-N-phenylthiophosphoroamidothioate, O,S-diallyl-N-2-chloropheny1- thiophosphoroamidothioate, O,S-diallyl-N4-butylphenylthiophosphoroamidothioate, O,S-dimethyl-N- 2,4-dicthylphenylthiophosphoroamidothioate, O,S- diethyl-N-2,3dimethy1phenylthiophosphoroamidothioate, O-allyl-S-propargyl-N-2-methyl-4-bromophenylthiophosphoroamidothioate, O-methyl-S-propargyl-N- 2-fluoro-4methylphenylthiophosphoroamidothioate, O,S-diisopropyl-N-trichloroethylthiophosphoroamidothioate, O,S-dimethylN ,N-di-trichloromethylthiophosphoroamidothioate, O,S-dimethyl-N,N-di-trichlorophenylthiophosphoroamidothioate, O,S-dimethyl-N.N

3 dil ,l ,2,Z-tetrachloroethylthiophosphoroamidothioate, O,S-dimethyl-N,N-di-4-chlorophenylthiophosphoroamidothioate, O,S-dimethyl-N,N-di-2,4- dichlorophenylthiophosphoroamidothioate, O-allyl-S methyl-N,N-di-4-bromophenylthiophosphoroamidothioate, O-propargyl-S-methyl-l\l,N-di-2,4-difluorophenylthiophosphoroamidothioate, O-ethyl-S-methyL N,N-di-3,4-dichlorophenylthiophosphoroamidothioate, O,S-dimethyl-N-trichloromethylthio-N-4-chlorophenylthiophosphoroamidothioate, O,S-dimethyl-N- ethylthio-N-phenylthiophosphoroamidothioate, O,S- dimethyl-N-methyl-N- l l ,2,Z-tetrachloroethylthiophosphoroamidothioate, O-methyl-S-allyl-N-trichloromethylthio-N-4-chloromethylthiophosphoroamidothioate, O-methyl-S-propyl-N- l -bromo- 2,2,Z-trichloroethylthio-N- l l ,2,Z-tetrachloroethylthiophosphoroamidothioate, O-methyl-S-allyl-N- l bromo-2,2,2-trichloroethylthio-N-2-fluorophenylthiophosphoroamidothioate, O,S-diallyl-N,N-diphenylthiophosphoroamidothioate, O,S-dimethyl-N,N-di-4- methylphenylthiophosphoroamidothioate, etc.

The compounds of the present invention in which R is hydrogen or an alkyl of l to 3 carbon atoms are prepared by the reaction of an appropriate O-hydrocarbyl-S-hydrocarbyl phosphoroamidothioate with a sulfenyl chloride according to the following reaction:

wherein R, R and R are as described above and R is hydrogen or alkyl of l to 3 carbon atoms. In this process, a molar amount, or slight excess of the sulfenyl chloride compound is reacted with a molar amount of the phosphoroamidothioate. The reaction is carried out in a solvent, such as dimethyl formamide or dioxane. The quantity of solvent in weight varies from 2 to l0 times the combined weight of the reactants. At least a molar equivalent of a base is included to remove the HCl as formed. Suitable bases include triethylamine, pyridine, quinuclidine and N-methylmorpholine.

The reactants in reaction (I) above are mixed at temperatures in the range of 0 to 150C. The reaction is exothermic and after mixing it is desirable to maintain the temperature within the range of 0 to 35C., preferably O to 25C., by external cooling, by mixing slowly, or both. Generally the reaction time is from to I minutes after the reactants have been combined.

To prepare compounds of the present invention wherein R is SR the mono-substituted amide is prepared according to reaction (1) above wherein R is hydrogen, and then the reaction product is reacted with a second mole of an appropriate sulfenyl chloride to give the desired diamide according to the following equation:

lll)

wherein R, R and R are as defined previously; and two R 's may be the same or different. The reaction conditions for reaction (II) are the same as for the first step described above, reaction (I). Of course, when prepar- 4 ing the diamide having two SR groups attached to the nitrogen and where the R s are the same, the appropriate O-hydrocarbyl-S-hydrocarbyl phosphoroamidothioate can be reacted with 2 moles of an appropriate sulfenyl chloride in the presence of two or more equivalents of base.

In all of the above reactions the product can be recovered by diluting the reaction mixture with a large excess of ice water and then extracting with a water insoluble organic solvent such as diethyl ether or chloroform. The extract is then dried and evaporated to give the crude product. This crude product can be used as such or can be further purified by chromatography or crystallization. The preferred solvents for crystallization are mixtures of benzene and hexane.

The present invention can be more fully understood by reference to the following examples.

EXAMPLE 1 Preparation of O,S-dimethyl-N-4-chlorophenylthiophosphoroamidothioate To an ice-cold solution of 10 g. (0.07l mole) of 0,8- dimethyl phosphoroamidothioate dissolved in 50 ml. of dimethylformamide containing 6 g. (0.076 mole) of pyridine there was slowly added 13 g. (0.073 mole) of 4-chlorophenylsulfenyl chloride. The resulting mixture was stirred for [V2 hours as the temperature was slowly increased from 0 to 25C. At the end of this time, the reaction mixture was combined with 250 ml. of ether and then washed with 250 ml. of dilute salt water, and with ml. of saturated salt water. The ether solution was dried and then evaporated under vacuum. As the ether was being removed, the crude product precipitated, and was removed by filtration. The product, after crystallization from a benzene/hexane mixture, weighed 6 g. and had a melting point of 99102C. Analysis was as follows:

Calculated Found S X: 22.6 21.8 Cl 12.5 13.3 P 7c 10.9 1 1.2

The infrared spectra had strong adsorption bands at: 6.8, 7.2, 8.2, 9.65, 10.55 and 12.15 microns.

EXAMPLE 2 10 g. (0.035 mole) of O,S-dimethyl-N-4-chlorophenylthiophosphoroamidothioate, prepared as in Example l, was dissolved in 50 ml. of dimethyl formamide containing 2 g. (0.018 mole) of l,4-diazabicyclo[2,2,2] octane. This solution was cooled in an ice-bath and then 7 g. (0.039 mole) of 4-chlorophenylsulfenyl chloride was added slowly. When all had been added, the ice-bath was removed and the mixture was stirred at ambient temperature for l hour. At the end of this time 500 ml. of ice water was added. The resulting mixture was extracted with three 250 ml. portions of diethyl ether. The ether extracts were combined, washed with salt water and then dried. The ether solvent was removed by evaporation under vacuum to give the crude product. The crude product was dissolved in a mixture of ml. of benzene and 50 ml. of hexane. The resulting solution was added to a silica gel packed chromatography column and eluted with a 1:4 solution of chloroform:diethyl ether. The product was an oily liquid.

proper consideration of these factors being within the skill of those versed in the art. In general, the toxic ingredients of this invention will be effective in concentrations from about 0.0001 percent by weight to as high Analysis was as follows: 5 as 50 percent by weight or higher. Economically, of course, it is desirable to use lower concentrations of Calculated Found this active ingredient. Thus, it is usually desirable to use S 22b 22 l less than percent by weight of the active ingredient C] q 16,6 in a particular composition.

10 The following tests were conducted with compounds of the present invention to shown their insecticidal ac- The infrared spectra had strong adsorption bands at: i i y. h lfiSt results are I'BPOITGd in Table 6.8, 8.0, 915, 9.7-9.9, 10.9 and 12.1-12.3 microns. Test Procedures Other compounds of the present invention were pre- HOUSBflieS (MuSCa domesfim -l A 500 pp acetone pared by the procedures described above d a e tab solution of the candidate toxicant was placed in a milated in Table l. crosprayer (atomizer). A random mixture of anesthe- TABLE I Elemental Analysis 71 s N P Cl M.P. Compound Calc. Found Calc. Found Cale. Found Cale. Found C.

O.S-dimethyl-N-4-methylphenyl- 24.4 23.3 5.3 4.9 94-97 thiophosphoroamidothioatc O,S-dimethyl-N phenylthio- 25.7 25.4 12.4 12.3 69-72 phosphoroamidothioate O.SdimethylN- 1 1 ,2,2-tetra- 18.9 18.7 42.8 41.7 140442 chloroethyllhiophosphoroamidothioate O.S-diethyl-N-4-chlorophenyl- 20.5 20.4 1 1.4 1 1.5 Oil thiophosphoroamidothionate O,S-dimethyl-N,Ndi-4-methyl- 25.0 24.4 8.1 7.5 534.1 phenylthiophosphoroamidothioate tized male and female flies was placed in a container The compounds of the present invention find use as and 55 mg. of the above-described acetone solution insecticides. The terms insecticide and insect as was sprayed on them. A lid was placed on the conused herein refer to their broad and commonly under tainer. A mortality reading was made after 24 hours. stood usage rather than to those creatures which in the Aphids (Aphis gossypiz' Glover): An acetone solution strict biological sense are classified as insects. Thus, the 40 of the candidate toxicant containing a small amount of term insect is used not only to include small invertenonionic emulsifier was diluted with water to 30 ppm. brate animals belonging to class lnsecta but also to Cucumber leaves infested with the cotton aphids were other related classes of arthropods whose members are dipped in the toxicant solution. Mortality readings were segmented invertebrates having more or fewer than six then taken after 24 hours. legs, such as spider, mites, ticks, centipedes, worms and Two-spotted Mites (Tetramuchus urticae): An acethe like. tone solution of the candidate toxicant containing a i The compounds of the present invention may be apsmall amount of nonionic emulsifier was diluted with plied in either liquid or solid formulations to the inwater to 100 ppm. Pinto bean leaves which were insects, their environment or hosts susceptible to insect fested with mites were dipped in the toxicant solution. attack. For example, they may be sprayed or otherwise Mortality readings were taken after 24 hours. applied directly to plants or soil so as to effect control Cabbage looper (Trichoplusia ni): An acetone soluof insects coming into contact therewith. tion of the candidate toxicant containing a small Formulations of the compounds of this invention will amount of nonionic emulsifier was diluted with water comprise a toxic amount of one or more of the comto 500 ppm. Cucumber leaf sections were dipped in the pounds and a biologically inert carrier. Ususally they toxicant solution and dried. The sections were then inwill also contain a wetting agent. Solide carriers such as fested with cabbage looper larvae. Mortality readings clay, talc, sawdust and the like may be used in such forwere taken after 24 hours. mulations. Liquid diluents which may be used with Two-spotted Mites (Telramuchus urticae): Systemic these compounds include water and aromatic solvents. evaluation: An acetone solution of the candidate toxi- In addition these formulations may contain other comcant containing a nonionic emulsifier was diluted with patible pesticides,fillers, stabilizers, attractants and the water to give 500 ppm. solution. The solution was like. poured around pinto bean plants at a rate of 225 micro- The concentration of the active ingredient to be used grams per cm surface area of the soil around the with inert carriers, either solid or liquid carriers, will be plants. Two replicates were used. The plants were not dependent upon many factors, such as the particular watered for 24 hours and then were watered daily. 48

compound which is used, the carrier in or upon which it is incorporated, the method and conditions of application, the insect species to be controlled, etc., the

hours after treatment with the candidate toxicant the plants were infested with mites. The percent control based on the mortality of the mites was determined.

TABLE [1 7( Mortality Systemic Cabbage Evaluation Compound Houseflies Aphids Mites Looper Miles O,S dimethyl-N -4-chlomphen lthio- 100 60 l phosphoroamidothioate O,Sdimelhyl-N,Ndi-4 chlorophenyl- 100 95 lUU 78 100 thiophosphoruamidothioate O,S'dimethyl-N-4 methylphcnylthio IOU 99 100 phosphoroamidothioate O ,S-dimethyl-N -phenylthiuphosphoro I00 l I00 l ()0 I00 amidothioate O.Sdimethyl-N' l l .lltetrachlorolllO 98 99 I00 I (ll) cthylthiophosphoroamidolhioate O,S-diethyl-N-4-chlorophenylthio- 9U lOl] 78 ltlt) phosphoroamidothioate O,S-dimethyl-N,N-di-4-meth)lphenyllUO IOU l()(] 78 lUO thiophosphoroamidothioate As will be evident to those skilled in the art, various modifications on this invention can be made or followed, in the light of the foregoing disclosure and discussion, without departing from the spirit or scope of the disclosure or from the scope of the following claims.

It is claimed:

1. An insecticidal composition comprising an insecticidally effective amount of a compound of the formula wherein R and R are individually alkyl, alkenyl or alkynyl of up to 3 carbon atoms, R is hydrogen, alkyl of l to 3 carbon atoms or SR and R is alkyl of l to 4 carbon atoms substituted with O to 4 halogen atoms of atomic number 9 to 35 or aryl of 6 to 12 carbon atoms substituted with 0 to 4 alkyl groups individually of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35, and an inert carrier.

2. The composition of claim 1 wherein R and R are alkyl of l to 3 carbon atoms.

3. The composition of claim 1 wherein R is hydrogen or SR and wherein R is aryl of 6 to 12 carbon atoms substituted with 0 to 4 alkyl groups individually of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

4. The composition of claim 1 wherein R is alkyl of l to 2 carbon atoms, substituted with l to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with 0 to 2 alkyl groups of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

5. The composition of claim 1 wherein R is alkyl of l to 2 carbon atoms substituted with l to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with 0 to 1 alkyl group of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

6. The composition of claim 1 wherein R and R are individually alkyl of l to 2 carbon atoms, R is hydrogen and R is tetrachloroethyl or phenyl substituted with 0 to l methyl group or chlon'ne atom.

7. The composition of claim 1 wherein R and R are the same and are methyl or ethyl, R is hydrogen or SR and R is tetrachloroethyl or phenyl substituted with 0 to l alkyl group of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

8. The composition of claim 7 wherein the compound is O,S-dimethyl-N-4-chlorophenylthiophosphoroamidothioate.

9. The composition of claim 7 wherein the compound is O,S-dimethyl-N,N'di-4-chlorophenylthiophosphoroamidothioate.

10. The composition of claim 7 wherein the compound is O,S-dimethyl-N-4-methylphenylthiophosphoroamidothioate.

11. The composition of claim 7 wherein the compound is O,S-dimethyl-N-phenylthiophosphoroamidothioate.

12. The composition of claim 7 wherein the compound is O,S-dimethyl- N-l,l,2,2-tetrachloroethylthiophosphoroamidothioate 13. The composition of claim 7 wherein the compound is O,S-diethyl-N-4-chlorophenylthiophosphoroamidothioate.

14. The composition of claim 7 wherein the com pound is O,S-dimethyl-N,N-di-4-methylphenylthiophosphoroamidothioate 15. A method of killing insects which comprises applying to said insects an insecticidally effective amount of a compound of the formula wherein R and R are individually alkyl, alkenyl or alkynyl of up to 3 carbon atoms, R is hydrogen, alkyl of l to 3 carbon atoms or SR and R is alkyl of l to 4 carbon atoms substituted with O to 4 halogen atoms of atomic number 9 to 35 or aryl of 6 to 12 carbon atoms substituted with 0 to 4 alkyl groups individually of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

16. The method of claim 15 wherein R and R are alkyl of l to 3 carbon atoms.

17. The method of claim 15 wherein R is hydrogen or SR and wherein R is aryl of 6 to 12 carbon atoms substituted with 0 to 4 alkyl groups individually of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

18. The method of claim 15 wherein R is alkyl of l to 2 carbon atoms, substituted with l to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with 0 to 2 alkyl groups of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

19. The method of claim 15 wherein R is alkyl of l to 2 carbon atoms substituted with l to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with O to l alkyl group of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

20. The method of claim 15 wherein R and R are individually alky] of l to 2 carbon atoms, R is hydrogen and R is tetrachloroethyl or phenyl substituted with to 1 methyl group or chlorine atom.

21. The method of claim wherein R and R are the same and are methyl or ethyl, R is hydrogen or SR and R is tetrachloroethyl or phenyl substituted with 0 to 1 alkyl group of l to 4 carbon atoms or halogen atoms of atomic number 9 to 35.

22. The method of claim 21 wherein the compound is O.S-dimethyl-N-4-ch]orophenylthiophosphoroamidothioate.

23. The method of claim 21 wherein the compound is O,S-dimethyl-N,N-di-4-chlorophenylthiophosphoroamidothioate.

24. The method of claim 21 wherein the compound is O,S-dimethyl-N-4-methylphenylthiophosphoroamidothioate.

25. The method of claim 21 wherein the compound is O.S-dimethy|-Nphenylthiophosphoroamidothioate.

26. The method of claim 21 wherein the compound is O,S-dimethyl-N-1 l ,2.2-tetrachloroethylthiophosphoroamidothioate.

27. The method of claim 21 wherein the compound is O.S-diethyl-N-4-chlorophenylthiophosphoroamidothioate.

28. The method of claim 21 wherein the compound is O,S-dimethyl-N,N-di-4-methylphenylthiophosphoroamidothioate. 

1. AN INSECTICIDAL COMPOSITION COMPRISING AN INSECTICIDALLY EFFECTIVE AMOUNT OF A COMPOUND OF THE FORMULA
 2. The composition of claim 1 wherein R and R1 are alkyl of 1 to 3 carbon atoms.
 3. The composition of claim 1 wherein R2 is hydrogen or -SR3 and wherein R3 is aryl of 6 to 12 carbon atoms substituted with 0 to 4 alkyl groups individually of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to
 35. 4. The composition of claim 1 wherein R3 is alkyl of 1 to 2 carbon atoms, substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with 0 to 2 alkyl groups of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to
 35. 5. The composition of claim 1 wherein R3 is alkyl of 1 to 2 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or phenyl Substituted with 0 to 1 alkyl group of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to
 35. 6. The composition of claim 1 wherein R and R1 are individually alkyl of 1 to 2 carbon atoms, R2 is hydrogen and R3 is tetrachloroethyl or phenyl substituted with 0 to 1 methyl group or chlorine atom.
 7. The composition of claim 1 wherein R and R1 are the same and are methyl or ethyl, R2 is hydrogen or -SR3 and R3 is tetrachloroethyl or phenyl substituted with 0 to 1 alkyl group of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to
 35. 8. The composition of claim 7 wherein the compound is O,S-dimethyl-N-4-chlorophenylthiophosphoroamidothioate.
 9. The composition of claim 7 wherein the compound is O,S-dimethyl-N,N-di-4-chlorophenylthiophosphoroamidothioate.
 10. The composition of claim 7 wherein the compound is O,S-dimethyl-N-4-methylphenylthiophosphoroamidothioate.
 11. The composition of claim 7 wherein the compound is O,S-dimethyl-N-phenylthiophosphoroamidothioate.
 12. The composition of claim 7 wherein the compound is O,S-dimethyl-N-1,1,2,2-tetrachloroethylthiophosphoroamidothioate.
 13. The composition of claim 7 wherein the compound is O,S-diethyl-N-4-chlorophenylthiophosphoroamidothioate.
 14. The composition of claim 7 wherein the compound is O,S-dimethyl-N,N-di-4-methylphenylthiophosphoroamidothioate.
 15. A method of killing insects which comprises applying to said insects an insecticidally effective amount of a compound of the formula
 16. The method of claim 15 wherein R and R1 are alkyl of 1 to 3 carbon atoms.
 17. The method of claim 15 wherein R2 is hydrogen or -SR3 and wherein R3 is aryl of 6 to 12 carbon atoms substituted with 0 to 4 alkyl groups individually of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to
 35. 18. The method of claim 15 wherein R3 is alkyl of 1 to 2 carbon atoms, substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with 0 to 2 alkyl groups of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to
 35. 19. The method of claim 15 wherein R3 is alkyl of 1 to 2 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or phenyl substituted with 0 to 1 alkyl group of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to
 35. 20. The method of claim 15 wherein R and R1 are individually alkyl of 1 to 2 carbon atoms, R2 is hydrogen and R3 is tetrachloroethyl or phenyl substituted with 0 to 1 methyl group or chlorine atom.
 21. The method of claim 15 wherein R and R1 are the same and are methyl or ethyl, R2 is hydrogen or -SR3 and R3 is tetrachloroethyl or phenyl substituted with 0 to 1 alkyl group of 1 to 4 carbon atoms or halogen atoms of atomic number 9 to
 35. 22. The method of claim 21 wherein the compound Is O,S-dimethyl-N-4-chlorophenylthiophosphoroamidothioate.
 23. The method of claim 21 wherein the compound is O,S-dimethyl-N,N-di-4-chlorophenylthiophosphoroamidothioate.
 24. The method of claim 21 wherein the compound is O,S-dimethyl-N-4-methylphenylthiophosphoroamidothioate.
 25. The method of claim 21 wherein the compound is O,S-dimethyl-N-phenylthiophosphoroamidothioate.
 26. The method of claim 21 wherein the compound is O,S-dimethyl-N-1,1,2,2-tetrachloroethylthiophosphoroamidothioate.
 27. The method of claim 21 wherein the compound is O,S-diethyl-N-4-chlorophenylthiophosphoroamidothioate.
 28. The method of claim 21 wherein the compound is O,S-dimethyl-N,N-di-4-methylphenylthiophosphoroamidothioate. 